Plastic profile hollow inner and outer skin mold

Abstract

The application discloses a plastic profile hollow inner and outer skin mold forming and shaping system which is provided with an inner cavity cooling and shaping device (5) and an outer wall cooling and shaping device (6). A die head die core (4) is arranged between the inner cavity cooling and shaping device (5) and the outer wall cooling and shaping device (6). The distance between the outer wall of the die head die core (4) and the inner surface of the outer wall cooling and shaping device (6) and the distance between the inner wall of the die head die core (4) and the outer surface of the inner cavity cooling and shaping device (5) are the wall thickness of the plastic profile. The above technical scheme realizes the extrusion manufacturing of the inner and outer skin hollow foamed profile, solves the extrusion problem of the large-wall-thickness foamed profile product, and obtains the plastic profile inner and outer skin product with stable size and shape.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of plastic profile extrusion equipment. More specifically, the present application relates to a plastic profile hollow inner and outer skin mold. BACKGROUND

[0002] In the prior art, most of the foaming molds in the plastic profile extrusion industry are solid foaming molds. The solid foaming mold has the following problems and defects:

[0003] 1. The wall thickness of the solid foaming mold profile is not easy to be too thick, and the large wall thickness profile has uneven density during the extrusion foaming process, and the profile strength is unstable.

[0004] 2. The profile produced by the solid foaming mold has a relatively heavy specific gravity, which is not conducive to the control of the cost of the extrusion raw material, and the profile has a large processing difficulty during the extrusion process, is not easy to form, or the formed size is unstable.

[0005] Search for existing technology disclosed in Chinese patent documents:

[0006] "A PVC solid core foaming profile mold" (Patent No.: 201821440065.8), the technical solution recorded is:

[0007] The PVC solid core foaming profile mold comprises a support plate, a profile core plate, a first limiting sliding block, a second limiting sliding block, a connecting plate, a rotating disc, and a support rod.

[0008] The technical effect is that the PVC solid core foaming profile mold has an exhaust hole in the middle, making production more stable, and one end is provided with a comb shape, making the profile foaming more dense.

[0009] Obviously, the above-mentioned existing patent literature does not solve the existing problems and defects. SUMMARY

[0010] The present application provides a plastic profile hollow inner and outer skin mold, which aims to obtain a plastic profile foaming product with stable size and shape.

[0011] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is:

[0012] The hollow inner and outer skin forming die of the plastic profile of the present application comprises a core die support plate, a material compression plate and a die head forming plate; the forming and shaping system is provided with an inner cavity cooling and shaping device and an outer wall cooling and shaping device, and a die head core is arranged between the inner cavity cooling and shaping device and the outer wall cooling and shaping device; the distance between the outer wall of the die head core and the inner surface of the outer wall cooling and shaping device and the distance between the inner wall of the die head core and the outer surface of the inner cavity cooling and shaping device are the wall thickness of the plastic profile.

[0013] A foaming agent is injected into the material of the plastic profile.

[0014] The space formed by the die head core on the plastic profile is an inner and outer skin forming space; the inner and outer skin forming space is a foaming filling space; when the plastic profile is cooled and formed, the material therein which has not been cooled foams uniformly into the inner and outer skin forming space and is formed.

[0015] The material is compressed by a certain ratio in the area of the material compression plate, and the compression ratio is controlled to be between 3.5 and 5.5, so that the material has a certain density.

[0016] Cooling water channels are arranged in the inner blocks of the inner cavity cooling and shaping device and the outer wall cooling and shaping device.

[0017] The inner cavity cooling and shaping device is connected and fixed with the die head core through a lead screw and a nut.

[0018] The end face shape structure of the inner cavity cooling and shaping device is consistent with the shape of the inner cavity of the plastic profile, and plays a role in rapidly cooling and shaping the inner cavity of the plastic profile.

[0019] The end face shape structure of the outer wall cooling and shaping device is consistent with the shape of the outer surface of the plastic profile, and plays a role in cooling and shaping the outer surface of the plastic profile.

[0020] The hollow inner and outer skin forming die is designed through a die head shunt structure, the material flow forms two discharge flow channels of inner wall and outer wall, and the two extruded materials rapidly enter a cooling and shaping cooling system after leaving the heating forming area of the die, so that the inner cavity and the outer wall are rapidly skinned to form a plastic profile product with a required shape and size; the cooperation of the inner cavity cooling and shaping device and the outer wall cooling and shaping device provides a reaction force for the material to expand out of the die, and finally a plastic profile product with uniformly foamed and filled cross section is obtained.

[0021] The present application adopts the above technical scheme, realizes the extrusion manufacturing of the hollow foamed profile, can solve the extrusion problem of the large wall thickness foamed profile product, and obtains a plastic profile product with stable size and shape, inner and outer skin, and uniformly hollow foamed filling. BRIEF DESCRIPTION OF DRAWINGS

[0022] The contents shown in the drawings and the marks in the drawings are briefly described as follows:

[0023] Figure 1 It is a three-dimensional schematic view of the hollow inner and outer skin mold for plastic profile in the application;

[0024] Figure 2 It is a cross-sectional discharge schematic view of the hollow inner and outer skin mold for plastic profile in the application.

[0025] The marks in the drawings are:

[0026] 1, core mold support plate, 2, material compression plate, 3, die head forming plate, 4, die head core, 5, inner cavity cooling and shaping device, 6, outer wall cooling and shaping device, 7, inner and outer skin space. DETAILED DESCRIPTION

[0027] The specific embodiments of the application are further described in detail below with reference to the drawings, by describing the embodiments, to help the skilled in the art to have more complete, accurate and in-depth understanding of the inventive concept and technical solution of the application.

[0028] As Figure 1 , Figure 2 shown in the application, it is a hollow inner and outer skin mold for plastic profile, and the forming and shaping system thereof comprises a core mold support plate 1, a material compression plate 2 and a die head forming plate 3.

[0029] The hollow inner and outer skin mold for plastic profile of the application has the structure that the material is extruded simultaneously in the inner cavity and the outer wall, and when the material leaves the extrusion die head, the inner and outer walls are rapidly cooled simultaneously by the dry cooling system, so as to produce the skin layer and control the forming size of the outer wall and the inner cavity.

[0030] In order to solve the problems existing in the prior art and overcome its defects, and realize the application purpose of obtaining the plastic profile inner and outer skin product with stable size, shape, uniform foaming filling and hollow inner cavity, the technical scheme adopted by the application is as follows:

[0031] As Figure 1 , Figure 2 shown in the application, the hollow inner and outer skin mold for plastic profile, the forming and shaping system is provided with an inner cavity cooling and shaping device 5 and an outer wall cooling and shaping device 6, and a die head core 4 is arranged between the inner cavity cooling and shaping device 5 and the outer wall cooling and shaping device 6; the distance between the outer wall of the die head core 4 and the inner surface of the outer wall cooling and shaping device 6 and the distance between the inner wall of the die head core 4 and the outer surface of the inner cavity cooling and shaping device 5 are the wall thickness size of the plastic profile.

[0032] The present application realizes the extrusion manufacturing of the inner and outer skin and hollow foaming profile, and can solve the extrusion of the large wall thickness foaming filling profile product, and obtain the plastic profile product with stable size and shape.

[0033] The foaming agent is injected into the material of the plastic profile.

[0034] The space formed by the die core 4 on the plastic profile is the inner and outer skin space 7; when the plastic profile is cooled and formed, the material which has not been cooled is freely foamed and filled into the inner and outer skin space 7 and formed.

[0035] In Figure 2 The black shadow part is the discharge gap of the outer wall and the inner wall, and the shadow part between the inner and outer skin space 7; after the material leaves the die and enters the forming and shaping system, the inner wall and the outer wall are rapidly cooled to produce skin constraint product end face shape. Since the material is added with the foaming agent, it can only be freely foamed and filled into the inner and outer skin space.

[0036] After the material passes through the core mold support plate 1 area and passes through the heating plasticization and flow stabilization process stage, the material is compressed by a certain proportion in the material compression plate 2 area, and the compression ratio is controlled between 3.5-5.5, so that the material has a certain density.

[0037] The material after compression enters the die forming plate 3, and the die forming plate 3 and the die model 4 form a die gap between them. The material in the die gap area forms a product melt embryo with stable flow rate, and its shape structure meets the design requirements of the product.

[0038] Cooling water channels are arranged in the inner blocks of the inner cavity cooling and shaping device 5 and the outer wall cooling and shaping device 6.

[0039] The inner cavity cooling and shaping device 5 is connected and fixed with the die core 4 through a screw rod and a nut.

[0040] The end face shape structure of the inner cavity cooling and shaping device 5 is consistent with the shape of the inner cavity of the plastic profile, and plays a role in rapidly cooling and shaping the inner cavity of the plastic profile.

[0041] The end face shape structure of the outer wall cooling and shaping device 6 is consistent with the shape of the outer surface of the plastic profile, and plays a role in cooling and shaping the outer surface of the plastic profile.

[0042] The inner cavity cooling and shaping device 5 is connected and fixed on the die core 4 through a screw rod and a nut, and its end face shape structure is consistent with the shape of the product inner cavity, and plays a role in shaping the inner cavity. The inner cavity cooling and shaping device 5 is internally designed with a circulating water channel. In the extrusion process, high-flow-rate cooling circulating water is passed, so that the product inner wall is rapidly cooled and skinned to form a stable and smooth skin layer.

[0043] The outer wall cooling and shaping device 6 is also internally passed with cooling circulating water to take away the outer wall heat of the extruded melt, and plays a role in rapid cooling. The cavity structure controls the shape and size of the product.

[0044] The material with a certain foaming agent is adopted, and is heated and plasticized at the die head part of the extrusion equipment and the mold through a conventional extrusion process. The hollow inner and outer skin mold is designed through the die head shunt structure. The material flow forms two discharge flow channels of inner wall and outer wall. The two extruded materials rapidly enter the shaping and cooling system after leaving the heating and forming area of the mold, so that the inner cavity and the outer wall are rapidly skinned to form the required shape and size of the plastic profile external contour. The material between the two skin layers is freely foamed to fill the cross-section gap area of the profile, and the hollow foaming profile product with dense and uniform inner and outer skin is formed.

[0045] The cooperation of the inner cavity cooling and shaping device 5 and the outer wall cooling and shaping device 6 provides a reaction force for the material to expand after leaving the mold, and finally the plastic profile product with uniform cross-section foaming is obtained.

[0046] The above has exemplarily described the present application in combination with the drawings. Apparently, the specific implementation of the present application is not limited by the above manner. Various non-essential improvements or direct application of the concept and technical solution of the present application to other occasions without improvement are within the protection scope of the present application.

Claims

1. A hollow inner and outer skin mold for plastic profiles, the molding and shaping system of which includes a core mold support plate (1), a material compression plate (2) and a mold head forming plate (3); Its features are: The molding and shaping system is provided with an inner cavity cooling and shaping device (5) and an outer wall cooling and shaping device (6). A mold head and mold core (4) are provided between the inner cavity cooling and shaping device (5) and the outer wall cooling and shaping device (6). The distance between the outer wall of the mold head and mold core (4) and the inner surface of the outer wall cooling and shaping device (6), and the distance between the inner wall of the mold head and mold core (4) and the outer surface of the inner cavity cooling and shaping device (5) are the wall thickness of the plastic profile. Inject a foaming agent into the material of the aforementioned plastic profile; The space formed by the mold head and mold core (4) on the plastic profile is the inner and outer skinning space (7); the inner and outer skinning space (7) is the foaming filling space; when the plastic profile is cooled and formed, the uncooled material in it foams into the inner and outer skinning space (7) and fills it evenly and forms it. The material is compressed in the material compression plate (2) area at a certain ratio, and the compression ratio is controlled between 3.5 and 5.5, so that the material has a certain density. Cooling water channels are provided inside both the inner cavity cooling and shaping device (5) and the outer wall cooling and shaping device (6); The internal cavity cooling and shaping device (5) is connected and fixed to the mold head and mold core (4) by a lead screw and nut; The end face shape of the inner cavity cooling and shaping device (5) is consistent with the inner cavity shape of the plastic profile, which plays the role of rapidly cooling and shaping the inner cavity of the plastic profile. The end face shape of the outer wall cooling and shaping device (6) is consistent with the outer surface shape of the plastic profile, which plays the role of cooling and shaping the outer surface of the plastic profile. The hollow inner and outer skinning mold, through the design of the die head diversion structure, forms two discharge channels on the inner and outer walls. After the two extruded materials leave the heating and forming area of ​​the mold, they simultaneously and rapidly enter the forming and shaping system, thereby quickly forming a skin on both the inner cavity and the outer wall, forming the outer contour of the plastic profile of the required shape and size. The combined use of the inner cavity cooling and shaping device (5) and the outer wall cooling and shaping device (6) provides a reaction force for the material to expand after leaving the mold, and finally obtains a plastic profile product with uniform cross-sectional foaming and filling.

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